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AS/NZS 3678 Grade 400 vs AS/NZS 1594 HA350

Related Material — 66.7% match based on chemical composition and mechanical property overlap.

AS/NZS 3678 Grade 400 (AS/NZS 3678:2016) and AS/NZS 1594 HA350 (AS/NZS 1594:2025) are both steel grades. Both fall under the Structural Steel category. AS/NZS 3678 Grade 400 is typically used for heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns., while AS/NZS 1594 HA350 is commonly used for automotive structural parts, trailers, agricultural equipment, general fabrication, light structural sections.. AS/NZS 3678 Grade 400 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand, while AS/NZS 1594 HA350 is defined under Australian/New Zealand Standard (AS/NZS), originating from Australia/New Zealand.

As per chemical composition, AS/NZS 3678 Grade 400 vs AS/NZS 1594 HA350 is a 100% match. As per mechanical properties, the match is 0%. Combined, this makes them a related material overall at 66.7%.

Frequently Compared With AS/NZS 3678 Grade 400:
AS/NZS 1595 C450 AS/NZS 3679.1 300 AS/NZS 1595 C350 AS/NZS 3679.1 350 IS 2062 E250A IS 2062 E250B0 ASTM A1008 SS Grade 50 ASTM A1008 SS Grade 80 ASTM A283C CSA G40.21 300W ASTM A572 Gr.65 CSA G40.21 400A
Match Breakdown
CHEMISTRY MATCH
100%
MECHANICAL MATCH
0%
OVERALL
66.7%
Specifications
Property AS/NZS 3678 Grade 400 AS/NZS 1594 HA350
Standard AS/NZS 3678:2016 AS/NZS 1594:2025
Category Structural Steel Structural Steel
C (%) max 0.2 max 0.2
Mn (%) max 1.6 max 1.6
Si (%) max 0.55 max 0.55
P (%) max 0.03 max 0.03
S (%) max 0.03 max 0.03
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property AS/NZS 3678 Grade 400 AS/NZS 1594 HA350
Yield Strength 400 MPa min (t<=12mm) 350 MPa min (AS/NZS 1594)
Tensile Strength ~520 MPa min (approx, equivalent to ASTM A572 Gr.60) Not specified
Typical Applications
AS/NZS 3678 Grade 400
Heavy structural fabrication, crane booms, mining machinery, earthmoving equipment, structural columns.
AS/NZS 1594 HA350
Automotive structural parts, trailers, agricultural equipment, general fabrication, light structural sections.
Can AS/NZS 3678 Grade 400 Be Substituted With AS/NZS 1594 HA350?
AS/NZS 3678 Grade 400 and AS/NZS 1594 HA350 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
Forms & Sizes Available on M-EX
AS/NZS 3678 Grade 400
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3000–3700 mm (118.11–145.67 in)
AS/NZS 1594 HA350
Plate → (2 listings)
Thickness: 10–10 mm (0.39–0.39 in)
Width: 1500–1500 mm (59.06–59.06 in)
Length: 3100–3600 mm (122.05–141.73 in)
On M-EX Right Now
AS/NZS 3678 Grade 400
2 active listings and RFQs →
AS/NZS 1594 HA350
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between AS/NZS 3678 Grade 400 and AS/NZS 1594 HA350?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can AS/NZS 3678 Grade 400 be substituted with AS/NZS 1594 HA350?
AS/NZS 3678 Grade 400 and AS/NZS 1594 HA350 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.